thompson



(No Model.) 2 Sheets-Sheet 1.,

J. THOMPSON.

v TRAVELING CRANE. No. 262,709. Patented Aug. 15, 1882.

(No Model.) 2 Sheets-Sheet 2.

J. THOMPSON.

TRAVELING CRANE. 7 No. 262,709. Patented Aug. 15, 1882.

mam /(1x65; I Ewe/Z507";

N FETEns PholoLxlhggnphur. Washington. D. c.

UNITED STATES.

PATENT OFFICE.

JOHN THOMPSON, OF BUOYRUS, OHIO, ASSIGNOR TO THE BUOYRUS FOUNDRY AND MANUFACTURING COMPANY, OF SAME PLACE.

TRAVELING CRANE.

SPECIFICATION forming part of Letters Patent No. 262,709, dated August 15, 1882.

Application filed July 13, 1882. (No model.)

To all whom it may concern:

Be it known that I, JOHN THOMPSON, of Encyrus, in the county of Crawford and State of Ohio, have invented certain Improvements in 5 Traveling Cranes; and I hereby declare the following to bea full, clear, and exact description thereof, reference being bad to the accompanying drawings, makinga part of this specitication, in which- IO Figure 1 is a side elevation of my improved crane applied to a railroad-truck. Fig. 2 is a plan view of the same. Fig. 3 is avertical section through the mast. Fig. 4 is a horizontal section through; the mast on the line w of Fig. 1. Fig. 5 illustrates details.

The object of my invention is to provide a traveling crane for use on railroad-trucks and other mountings, and to which excavating or hoisting devices may be attached wherein there shall be a mast having a great degree of strength and rigidity,'and wherein the cranearms are susceptibleof being lowered to pass beneath bridges or other obstructions.

My invention consists in a cast mast pro- 2 5 vided with a series-0f internal ribs or webs converging toward the center, in combination with the hub and fastening devices.

My invention further consists in a combination and arrangement of devices whereby the 0 crane-arms may be lowered at will,all of which is hereinafterdescribed,and specifically pointed out in the claims.

In orderthat those skilled in the art may make and use my invention, I will proceed to ,3 5 describe the manner in which I have carried it out.

In the said drawings, A is a railroad-truck, shown for purposes of illustration, upon one end of which is a step, into which is set the 40 lower end of the mast B, which is cast hollow.

and its interior provided with a series of converging ribs or webs, a a, and terminating in a central hub, b, which has an opening through which passes a bolt, 0. This bolt then passes I through the base of the mast, and by means 5 of nuts (I d and channel-iron D the mast is secured in a rigid position to the body of the car.

In order to provide a ready means for lowering the crane-arms, I swing the upper arms to the top of the mast by means of trunnions E E, and the lower ends of the lower cranearms, F F, rest against diagonal-faced removable shoes H H, which are secured at the sides of the base of the masts by bolts and fillets in 5 said base. The form of the removable shoes is illustrated in Fig. 5, and it will be seen that a species of pocket to receive the ends of arms F F is the result.

Between armsF F is secured by bolts a bail- 6o yoke, G, fitted with a ball-seated nut, 0, so as to permit the oscillation of a screw, I, the end of which rests in a socket, f, in the face of the mast. The removable shoes 1111 being taken from their fastenings, the lower ends of arms F F are passed by the base of the mast by withdrawing screw I through nut e, and the peak of the crane is lowered into any desired position.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1.. In a crane, the hollow mast B, provided with the interior ribs or webs, a a, converging to a central hub, b, in combination with fastening devices to secure the said mast to its supports, substantially as set forth.

2. The mastB and removable shoes H at its base, in combination with the crane-arms F, interposed yoke G, provided with a ballseated nut, 0, and screw I, having its end resting in socketf, all constructed, arranged, and operated substantially as described.

JOHN THOMPSON.

Witnesses:

ALLEN CAMPBELL, W. B. CRITTENDEN. 

